Apparatus for drying air for metallurgical purposes.



N0- 839,362. I PATENTED DEC. 25

GI GATTANEO & J. SGHLESINGER. APPARATUS FOR DRYING AIR FOR METALLURGICALPURPOSES.-

APPLICATION FILED JAILQ. 1905.

W/T/VESSL'S:

eiosnrrij: CATTA/NEO.

or OI IARLO'lTENBURG, AND 'JULws SCHLESINGER, or BERLIN,

GERMANY.

APPARATUS FOR DFiYING Am sosmsrauueeicm. Puaeoese,

To all whom it may concern.-

Be it known that we, GIUSEPPE CA'rTANEo, mechanical engineer, a subjectof the King of Italy, and a resident of Friedbergstra'sse 32,Charlott'enburg, near Berlin, Germany, and JULIUS SCHLESINGER,mechanical engineer, a citizen ofthe United States of America, and

.a resident of Geisber strasse 31, Berlin, Gerdown by coming intocontact with cold metallic. surfaces-for instance, the surfaces of pipesthrough which cold brine is flowing, in

V ayer of rime.

10h case the water separated from the air: is deposited in the formofhoar-frost or rime on the surface of the ipes. When thelayer of rime hasbecome 0 a certain thickness, the

cooling apparatus mustbe disconnected and ut in workingorder again bythawing thef Consequently two apparatuses at least are necessary, whichserve alternatelyv for coolin Apart from the costs and complicationosuch a plant connected with transposing or change-over devices the plantin additionpossesses the importantdefeet that the layer of rime becomingdeposited on the pi es not only impairs the trans-I mission of cold, butalso the resistance in'the movement of the air, which is considerablefrom the butset and which is ofiered by the s stems 'of pipes to the airas it sweeps t ough is increased inthe course of the running of theplant, in consequence of the in creasing narrowing of thecross-sectional area of; the free space betweenthe pi es. For thisreason in the case of such coo ing apparatuses an auxiliary blo'wingdevice or fan is employed, which relieves the blowing-engine from thework of suction.

The employment of several coolersto be used alternately, as well as theuse of auxiliary blowing devices, is avoided by the method forming partof the subject-matter of the present application, which method rendersit possible to work perfectly continuously.

Specification of Letters Patent Application filed-lander 9. 1906. SerialNo; 240.373f

Patented Dec. 25, ieoe.

The new apparatus brings the air into direct contact with a cooledliquid in the form .of rain, so that there is substantially noobstruction to the fi'owjof the air. 1 The cooling preferably takesplace-down toxbelow 0. but

according to the degree to which it is desired to dry the air the liquidmay have a tempera ture above 0.

It has been-proved to be particularly useful and practical for the liq-.

uid to-have a temperature of from 3 to -5. It is understood that thelower the temperature the greater the extraction of moisture will be. Itis preferableto emplo. a Ii uid having hygroscopic ualitiessuc as, i orinstance a solution of c orid of magnesium, chlorid of calcium, chloridof sodium, or the like.

The. air is preferably passed through a chamber'in'w'hich it is exposedto a shower of cold. lyein the form of rain.-- 'By this meansit comesinto intimatecontact with the colder lye, and the moisture which it con-.tains in consequence ofthe sudden drop in' temperature is deposited onthe surfaces of the falling particles of liquid as well as ab-v sorbedin consequence of the hygroscopic quality oi the brine, so that thedrying action ismorefintense than in the case where the coolingisefi'ected indirectly by the walls of ipes; Of course the freezing ofthe cooling iquid' at low temperature is prevented by a suitable contentof the salts. Moreover, whereas the resistance offered to the air on itspassage through a cooler provided.- with. coo ing-pipes increases: moreand more in consequence of the continuallygrowing layer of rime theresistance when using a shower of liquid as a means for cooling remainsalways equally low. Finally, 0001111 by means of a shower of liquidpermitst e work to be 7 continuous without the use of transposing orchange-over devices as the moisture. in the.

air is continually talren up by the brin'e,so.

that it is necessary merely to concentrate the lye again, which can bereadily effected without interrupting the running of the plant. For thispurpose it is only necessary to draw off and concentrate by evaporationa portion of the lye returning to the refrigerator. This drawing off andconcentration can be effected either intermittently or continuously. A

continuous concentration'oi the lye can aiso be efiected either bypassing through a concentrator, the who e liquid returning from theair'cooling and drying apparatus to the refrignrator, or by passing apart of this liquid t ough the concentrator. In .thelatter case the partof the liquid passing through the concentrator must be more stronglyconcentratedin order that when m xed' with the part not concentrated byevaporation a solu-' tion of normal concentration may be obtained.

The plant represented in the drawing may serve for carrying out themethod.

R is the air cooling anddryin apparatus,

inthe top part of which distri uting-pi c are arranged, to which asuitable, 're er-z ably-hygroscopic, liquid is supplied orn-a reservoirc-in-order-to flow out throughuniformly distributed openings in #theform of rain. Beloweach-pipe a a-number of shallowdishes or trays b, ofsheet metalor the like, are arranged in the. form of cascades; 'lhebrine passing2 from the pipes w on -to the uppermost-trays dripsortrickles from tray to tray-and collects-in the lowerpart-of thechamber, from-which it is'conducted by a piped to the refrigerator K.

G is the blowing engine, which sucks the air'through the-coolin anddrying chamber R in the direction of t e arrow and forces-it toaiblast-furnace H or to-a Bessemer-eonverter' B or any othermetallurgical-furnace.

Kis the refrigerator-consisting of a tank 6, for'thecooling-liquid andof alcoil'f, arranged in said tank and surrounded by the cooling-liquid.. Through the coil f the cooling me- -dium circulates, whichmay-be either ammonia, carbonicsacid sulfur-011s dioxid or the like,creating cold by-evapora'tion, ascommonlyknown with-refrigeratingplants. A pipe 9- andipump h conduct the cooled liquid om therefrigerator: K to the reservoir 0. .By means of a partition-wall i acompartment-lc is formed, said-compartmentbeing connected, by means of api e land-pump. m,

with thelconcentrator C'. rom the-latter'a further pipe-nleails back tothe part of the refrigerator-containing the o'oil f. Theconcentre-torconsists-of. a boiler which is'heated in any-desired 'manne rrforinstance, byf

' means of aiooil p, supplied. with steam. i Between therrefrigerator-.K and the concentrator C a halt/equalizer- E isinserted;.in-Wh-ich the-cold liquid-coming from the refrigerator K flowsin the opposite direction-to and'is preliminarily heatedby the-warmliquid-com ing from theooncentrator E; the warm current beingat thesa'metimeleooled.

The'liquid stands in the refrigerator-K at the height of-the upper edgeof the partitionwall i. Inconsequence :of vthe taking-up of liqllaid tothe uppermost trayof eac the moisture by the liquid in the cooling anddr ing chamber R more liquid returns to the re compartment is. When adefinite quantity of liquid has collectedhere, it is pumped, by means ofthe pump m, through the pipe'l and the heat-equalizer E to theconcentrator C, so as to come in a concentrated condition through thepipe n and the heat-equalizer E to the refrigerator K.

igerator K than is drawn fromit, .so that liquid continually flows overthe wall 'i to the The ump m, as specified, may be allowed to worintermittently in order always to let,

a certain quan'tityof liquid-collect in the compartment 1:. It may,however, be kept running continuously ifirits output so adjusted that-it corresponds with the amount of moisture taken up in the cooling anddry- 'ing' chamber R. 7

WV hat we claim as our-invention, andtde- .sire to secure by LettersPatent, -is

1. Apparatus'for dryingblast-air for met-- allurgical purposesby-passing a current of air througha showerofa cooled hygroscopic liquid,coin rising the combination of achamber, a plurality of groups ofshallowtrickling- 'trays arranged-lathe form of cascades within saidchamber, andmeans for supplying the p.- stan'tially as'described. 2.Apparatus-for drying blast-air formet- 'allurgical purposes by passing acurrent of airthrough a shower of a cooled hygroscopic liquid comprisingthe combination 0 bar, aplurality ofgroups of shallow-trickling- -traysarranged'in" the-form of cascades within said 'chamber, and asupply-pipe,} having uni- 1 fermlyqlistributed o. enings,over-each-group a chamof tra s, substantial y as described.

3. n combination, an air cooling and dry-; ing-chamber, arefrigerator, aconoentrato'r, af

Bt1 RIlt;.-'l I1tO-Whl0h flows a quantity of liquid corresponding to theamount ofmoisi ture absorbed in=the cooling and dryingehamher, a pumpfor feeding this liquid-to' the concentrator, and a heat-equalizerinwhich the' cold liquid coming-from the refrigerator, and

the warm liquid coming-from the coh'centra tor exchange'their heat,substantially asde scribed. I a

-ln witness-whercot we have-hereunto ed ournamesdn the presenceof twosubscri 'g 7 =w1tnessesr JJULIUS. SCHLESINGER. Witnesses: V

JOHANNES Ham, HENRY HAsrER.

.. GIUSEPPE OATTAN OQ 1,

